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On a data sheet, record the number of “heads-up” and “Tails-up” pennies after the first shake.

Formula: ((# of Atoms to Start X 2)/2) X Half Life=Number of years Old Graph: Graph time vs. Title your graph and note the original number of Head-up Parent Pennies atoms.

Along the side, record the number of tails remaining, along the bottm record the trial numbers. When half of the original 100 pennies had come up heads and there were approximately 50 pennies in the cup.

When those pennies were dumped out, how many were left that came up heads? Virtual Dating uses Java applets (4.0 browsers recommended) to understand how a geologist would use this process to determine how old a rock or a fossil is.

By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.

They should also understand that the atoms of any element are alike but are different from atoms of other elements.

Cover the container and shake for about ten seconds (each shake represents 8500 years), holding it tightly to avoid them flying out. Next, remove all the pennies which are now “tails-up.” Count these and put them aside.

Problem: If every time you do the process you remove the pennies that come up heads, how many times of repeating the process will it take before all of the pennies have come up heads and are removed?

Predict an Answer: Analyze Results: Make a graph of the data. How many trials did it take for half of the pennies to have come up heads?

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